Which of the following is true regarding HPV vaccine strains? Current WHO recommendations for HPV vaccination is:
**Core Concept**
The Human Papillomavirus (HPV) vaccine is designed to protect against certain strains of HPV that cause cervical cancer and other diseases. The vaccine targets high-risk HPV types, such as **HPV 16 and 18**, which are responsible for the majority of cervical cancer cases.
**Why the Correct Answer is Right**
The correct answer is related to the current WHO recommendations for HPV vaccination, which include vaccination against **HPV 16 and 18**. These two strains are responsible for approximately 70% of cervical cancer cases worldwide. The vaccine also protects against **HPV 6 and 11**, which cause genital warts.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not include the most common high-risk HPV strains.
**Option B:** This option is incorrect because it may not include all recommended strains.
**Option D:** This option is incorrect because it may not align with current WHO recommendations.
**Clinical Pearl / High-Yield Fact**
It's essential to remember that the HPV vaccine is most effective when administered before exposure to the virus, ideally during the pre-teen years.
**Correct Answer:** D. 9-valent vaccine is recommended.